Abstract
The effect of an external transverse magnetic field on ionization injection of electrons in a laser wakefield accelerator (LWFA) is investigated by theoretical analysis and particle-in-cell simulations. On application of a few tens of Tesla magnetic field, both the electron trapping condition and the wakefield structure changes significantly such that injection occurs over a shorter distance and at an enhanced rate. Furthermore, beam loading is compensated for, as a result of the intrinsic trapezoidal-shaped longitudinal charge density profile of injected electrons. The nonlinear ionization injection and consequent compensation of beam loading lead to a reduction in the energy spread and an enhancement of both the charge and final peak energy of the electron beam from a LWFA immersed in the magnetic field.
Highlights
The laser wakefield accelerator (LWFA) [1, 2] has attracted growing attention over the last decades because it can sustain ultra-high acceleration gradients (GV/m)
We investigate the effect of an external transverse magnetic field (ETMF) on ionization injection in the LWFA
Here we find that the ETMF required for tuning the LWFA electron beam can be significantly reduced in the ionization injection scenario
Summary
The effect of an external transverse magnetic field on ionization injection of electrons in a laser wakefield accelerator (LWFA) is investigated by theoretical analysis and particle-in-cell simulations. Beam loading is compensated for, as a result of the intrinsic trapezoidalshaped longitudinal charge density profile of injected electrons. The nonlinear ionization injection and consequent compensation of beam loading lead to a reduction in the energy spread and an enhancement of both the charge and final peak energy of the electron beam from a LWFA immersed in the magnetic field
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